<?php
/**
 * #Celebrate Shieh
 *             ,%%%%%%%%,
 *           ,%%/\%%%%/\%%
 *          ,%%%\c "" J/%%%
 * %.       %%%%/ o  o \%%%
 * `%%.     %%%%    _  |%%%
 *  `%%     `%%%%(__Y__)%%'
 *  //       ;%%%%`\-/%%%'
 * ((       /  `%%%%%%%'
 *  \\    .'          |
 *   \\  /       \  | |
 *    \\/         ) | |
 *     \         /_ | |__
 *     (___________))))))) 攻城湿
 *
 *        _       _
 * __   _(_)_   _(_) __ _ _ __
 * \ \ / / \ \ / / |/ _` |'_ \
 *  \ V /| |\ V /| | (_| | | | |
 *   \_/ |_| \_/ |_|\__,_|_| |_|
 */
/** PHPExcel root directory */
if ( ! defined('PHPEXCEL_ROOT') ) {
    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/');
    require( PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php' );
}

/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
class PHPExcel
{
    /**
     * Unique ID
     *
     * @var string
     */
    private $uniqueID;

    /**
     * Document properties
     *
     * @var PHPExcel_DocumentProperties
     */
    private $properties;

    /**
     * Document security
     *
     * @var PHPExcel_DocumentSecurity
     */
    private $security;

    /**
     * Collection of Worksheet objects
     *
     * @var PHPExcel_Worksheet[]
     */
    private $workSheetCollection = [];

    /**
     * Calculation Engine
     *
     * @var PHPExcel_Calculation
     */
    private $calculationEngine;

    /**
     * Active sheet index
     *
     * @var integer
     */
    private $activeSheetIndex = 0;

    /**
     * Named ranges
     *
     * @var PHPExcel_NamedRange[]
     */
    private $namedRanges = [];

    /**
     * CellXf supervisor
     *
     * @var PHPExcel_Style
     */
    private $cellXfSupervisor;

    /**
     * CellXf collection
     *
     * @var PHPExcel_Style[]
     */
    private $cellXfCollection = [];

    /**
     * CellStyleXf collection
     *
     * @var PHPExcel_Style[]
     */
    private $cellStyleXfCollection = [];

    /**
     * hasMacros : this workbook have macros ?
     *
     * @var bool
     */
    private $hasMacros = FALSE;

    /**
     * macrosCode : all macros code (the vbaProject.bin file, this include form, code,  etc.), null if no macro
     *
     * @var binary
     */
    private $macrosCode;
    /**
     * macrosCertificate : if macros are signed, contains vbaProjectSignature.bin file, null if not signed
     *
     * @var binary
     */
    private $macrosCertificate;

    /**
     * ribbonXMLData : null if workbook is'nt Excel 2007 or not contain a customized UI
     *
     * @var null|string
     */
    private $ribbonXMLData;

    /**
     * ribbonBinObjects : null if workbook is'nt Excel 2007 or not contain embedded objects (picture(s)) for Ribbon
     * Elements ignored if $ribbonXMLData is null
     *
     * @var null|array
     */
    private $ribbonBinObjects;

    /**
     * The workbook has macros ?
     *
     * @return boolean true if workbook has macros, false if not
     */
    public function hasMacros()
    {
        return $this->hasMacros;
    }

    /**
     * Define if a workbook has macros
     *
     * @param boolean $hasMacros true|false
     */
    public function setHasMacros( $hasMacros = FALSE )
    {
        $this->hasMacros = (bool) $hasMacros;
    }

    /**
     * Set the macros code
     *
     * @param string $MacrosCode string|null
     */
    public function setMacrosCode( $MacrosCode = NULL )
    {
        $this->macrosCode = $MacrosCode;
        $this->setHasMacros(! is_null($MacrosCode));
    }

    /**
     * Return the macros code
     *
     * @return string|null
     */
    public function getMacrosCode()
    {
        return $this->macrosCode;
    }

    /**
     * Set the macros certificate
     *
     * @param string|null $Certificate
     */
    public function setMacrosCertificate( $Certificate = NULL )
    {
        $this->macrosCertificate = $Certificate;
    }

    /**
     * Is the project signed ?
     *
     * @return boolean true|false
     */
    public function hasMacrosCertificate()
    {
        return ! is_null($this->macrosCertificate);
    }

    /**
     * Return the macros certificate
     *
     * @return string|null
     */
    public function getMacrosCertificate()
    {
        return $this->macrosCertificate;
    }

    /**
     * Remove all macros, certificate from spreadsheet
     *
     */
    public function discardMacros()
    {
        $this->hasMacros         = FALSE;
        $this->macrosCode        = NULL;
        $this->macrosCertificate = NULL;
    }

    /**
     * set ribbon XML data
     *
     */
    public function setRibbonXMLData( $Target = NULL, $XMLData = NULL )
    {
        if ( ! is_null($Target) && ! is_null($XMLData) ) {
            $this->ribbonXMLData = [ 'target' => $Target, 'data' => $XMLData ];
        }
        else {
            $this->ribbonXMLData = NULL;
        }
    }

    /**
     * retrieve ribbon XML Data
     *
     * return string|null|array
     */
    public function getRibbonXMLData( $What = 'all' ) //we need some constants here...
    {
        $ReturnData = NULL;
        $What       = strtolower($What);
        switch ( $What ) {
            case 'all':
                $ReturnData = $this->ribbonXMLData;
                break;
            case 'target':
            case 'data':
                if ( is_array($this->ribbonXMLData) && array_key_exists($What, $this->ribbonXMLData) ) {
                    $ReturnData = $this->ribbonXMLData[ $What ];
                }
                break;
        }

        return $ReturnData;
    }

    /**
     * store binaries ribbon objects (pictures)
     *
     */
    public function setRibbonBinObjects( $BinObjectsNames = NULL, $BinObjectsData = NULL )
    {
        if ( ! is_null($BinObjectsNames) && ! is_null($BinObjectsData) ) {
            $this->ribbonBinObjects = [ 'names' => $BinObjectsNames, 'data' => $BinObjectsData ];
        }
        else {
            $this->ribbonBinObjects = NULL;
        }
    }

    /**
     * return the extension of a filename. Internal use for a array_map callback (php<5.3 don't like lambda function)
     *
     */
    private function getExtensionOnly( $ThePath )
    {
        return pathinfo($ThePath, PATHINFO_EXTENSION);
    }

    /**
     * retrieve Binaries Ribbon Objects
     *
     */
    public function getRibbonBinObjects( $What = 'all' )
    {
        $ReturnData = NULL;
        $What       = strtolower($What);
        switch ( $What ) {
            case 'all':
                return $this->ribbonBinObjects;
                break;
            case 'names':
            case 'data':
                if ( is_array($this->ribbonBinObjects) && array_key_exists($What, $this->ribbonBinObjects) ) {
                    $ReturnData = $this->ribbonBinObjects[ $What ];
                }
                break;
            case 'types':
                if ( is_array($this->ribbonBinObjects) &&
                    array_key_exists('data', $this->ribbonBinObjects) && is_array($this->ribbonBinObjects[ 'data' ]) ) {
                    $tmpTypes   = array_keys($this->ribbonBinObjects[ 'data' ]);
                    $ReturnData = array_unique(array_map([ $this, 'getExtensionOnly' ], $tmpTypes));
                }
                else {
                    $ReturnData = []; // the caller want an array... not null if empty
                }
                break;
        }
        return $ReturnData;
    }

    /**
     * This workbook have a custom UI ?
     *
     * @return boolean true|false
     */
    public function hasRibbon()
    {
        return ! is_null($this->ribbonXMLData);
    }

    /**
     * This workbook have additionnal object for the ribbon ?
     *
     * @return boolean true|false
     */
    public function hasRibbonBinObjects()
    {
        return ! is_null($this->ribbonBinObjects);
    }

    /**
     * Check if a sheet with a specified code name already exists
     *
     * @param string $pSheetCodeName Name of the worksheet to check
     *
     * @return boolean
     */
    public function sheetCodeNameExists( $pSheetCodeName )
    {
        return ( $this->getSheetByCodeName($pSheetCodeName) !== NULL );
    }

    /**
     * Get sheet by code name. Warning : sheet don't have always a code name !
     *
     * @param string $pName Sheet name
     *
     * @return PHPExcel_Worksheet
     */
    public function getSheetByCodeName( $pName = '' )
    {
        $worksheetCount = count($this->workSheetCollection);
        for ( $i = 0; $i < $worksheetCount; ++$i ) {
            if ( $this->workSheetCollection[ $i ]->getCodeName() == $pName ) {
                return $this->workSheetCollection[ $i ];
            }
        }

        return NULL;
    }

    /**
     * Create a new PHPExcel with one Worksheet
     */
    public function __construct()
    {
        $this->uniqueID          = uniqid();
        $this->calculationEngine = new PHPExcel_Calculation($this);

        // Initialise worksheet collection and add one worksheet
        $this->workSheetCollection   = [];
        $this->workSheetCollection[] = new PHPExcel_Worksheet($this);
        $this->activeSheetIndex      = 0;

        // Create document properties
        $this->properties = new PHPExcel_DocumentProperties();

        // Create document security
        $this->security = new PHPExcel_DocumentSecurity();

        // Set named ranges
        $this->namedRanges = [];

        // Create the cellXf supervisor
        $this->cellXfSupervisor = new PHPExcel_Style(TRUE);
        $this->cellXfSupervisor->bindParent($this);

        // Create the default style
        $this->addCellXf(new PHPExcel_Style);
        $this->addCellStyleXf(new PHPExcel_Style);
    }

    /**
     * Code to execute when this worksheet is unset()
     *
     */
    public function __destruct()
    {
        $this->calculationEngine = NULL;
        $this->disconnectWorksheets();
    }

    /**
     * Disconnect all worksheets from this PHPExcel workbook object,
     *    typically so that the PHPExcel object can be unset
     *
     */
    public function disconnectWorksheets()
    {
        $worksheet = NULL;
        foreach ( $this->workSheetCollection as $k => &$worksheet ) {
            $worksheet->disconnectCells();
            $this->workSheetCollection[ $k ] = NULL;
        }
        unset($worksheet);
        $this->workSheetCollection = [];
    }

    /**
     * Return the calculation engine for this worksheet
     *
     * @return PHPExcel_Calculation
     */
    public function getCalculationEngine()
    {
        return $this->calculationEngine;
    }    //    function getCellCacheController()

    /**
     * Get properties
     *
     * @return PHPExcel_DocumentProperties
     */
    public function getProperties()
    {
        return $this->properties;
    }

    /**
     * Set properties
     *
     * @param PHPExcel_DocumentProperties $pValue
     */
    public function setProperties( PHPExcel_DocumentProperties $pValue )
    {
        $this->properties = $pValue;
    }

    /**
     * Get security
     *
     * @return PHPExcel_DocumentSecurity
     */
    public function getSecurity()
    {
        return $this->security;
    }

    /**
     * Set security
     *
     * @param PHPExcel_DocumentSecurity $pValue
     */
    public function setSecurity( PHPExcel_DocumentSecurity $pValue )
    {
        $this->security = $pValue;
    }

    /**
     * Get active sheet
     *
     * @return PHPExcel_Worksheet
     *
     * @throws PHPExcel_Exception
     */
    public function getActiveSheet()
    {
        return $this->getSheet($this->activeSheetIndex);
    }

    /**
     * Create sheet and add it to this workbook
     *
     * @param int|null $iSheetIndex Index where sheet should go (0,1,..., or null for last)
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function createSheet( $iSheetIndex = NULL )
    {
        $newSheet = new PHPExcel_Worksheet($this);
        $this->addSheet($newSheet, $iSheetIndex);
        return $newSheet;
    }

    /**
     * Check if a sheet with a specified name already exists
     *
     * @param string $pSheetName Name of the worksheet to check
     *
     * @return boolean
     */
    public function sheetNameExists( $pSheetName )
    {
        return ( $this->getSheetByName($pSheetName) !== NULL );
    }

    /**
     * Add sheet
     *
     * @param PHPExcel_Worksheet $pSheet
     * @param int|null           $iSheetIndex Index where sheet should go (0,1,..., or null for last)
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function addSheet( PHPExcel_Worksheet $pSheet, $iSheetIndex = NULL )
    {
        if ( $this->sheetNameExists($pSheet->getTitle()) ) {
            throw new PHPExcel_Exception(
                "Workbook already contains a worksheet named '{$pSheet->getTitle()}'. Rename this worksheet first."
            );
        }

        if ( $iSheetIndex === NULL ) {
            if ( $this->activeSheetIndex < 0 ) {
                $this->activeSheetIndex = 0;
            }
            $this->workSheetCollection[] = $pSheet;
        }
        else {
            // Insert the sheet at the requested index
            array_splice(
                $this->workSheetCollection,
                $iSheetIndex,
                0,
                [ $pSheet ]
            );

            // Adjust active sheet index if necessary
            if ( $this->activeSheetIndex >= $iSheetIndex ) {
                ++$this->activeSheetIndex;
            }
        }

        if ( $pSheet->getParent() === NULL ) {
            $pSheet->rebindParent($this);
        }

        return $pSheet;
    }

    /**
     * Remove sheet by index
     *
     * @param int $pIndex Active sheet index
     *
     * @throws PHPExcel_Exception
     */
    public function removeSheetByIndex( $pIndex = 0 )
    {

        $numSheets = count($this->workSheetCollection);
        if ( $pIndex > $numSheets - 1 ) {
            throw new PHPExcel_Exception(
                "You tried to remove a sheet by the out of bounds index: {$pIndex}. The actual number of sheets is {$numSheets}."
            );
        }
        else {
            array_splice($this->workSheetCollection, $pIndex, 1);
        }
        // Adjust active sheet index if necessary
        if ( ( $this->activeSheetIndex >= $pIndex ) &&
            ( $pIndex > count($this->workSheetCollection) - 1 ) ) {
            --$this->activeSheetIndex;
        }

    }

    /**
     * Get sheet by index
     *
     * @param int $pIndex Sheet index
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function getSheet( $pIndex = 0 )
    {
        if ( ! isset($this->workSheetCollection[ $pIndex ]) ) {
            $numSheets = $this->getSheetCount();
            throw new PHPExcel_Exception(
                "Your requested sheet index: {$pIndex} is out of bounds. The actual number of sheets is {$numSheets}."
            );
        }

        return $this->workSheetCollection[ $pIndex ];
    }

    /**
     * Get all sheets
     *
     * @return PHPExcel_Worksheet[]
     */
    public function getAllSheets()
    {
        return $this->workSheetCollection;
    }

    /**
     * Get sheet by name
     *
     * @param string $pName Sheet name
     *
     * @return PHPExcel_Worksheet
     */
    public function getSheetByName( $pName = '' )
    {
        $worksheetCount = count($this->workSheetCollection);
        for ( $i = 0; $i < $worksheetCount; ++$i ) {
            if ( $this->workSheetCollection[ $i ]->getTitle() === $pName ) {
                return $this->workSheetCollection[ $i ];
            }
        }

        return NULL;
    }

    /**
     * Get index for sheet
     *
     * @param PHPExcel_Worksheet $pSheet
     *
     * @return int Sheet index
     * @throws PHPExcel_Exception
     */
    public function getIndex( PHPExcel_Worksheet $pSheet )
    {
        foreach ( $this->workSheetCollection as $key => $value ) {
            if ( $value->getHashCode() == $pSheet->getHashCode() ) {
                return $key;
            }
        }

        throw new PHPExcel_Exception("Sheet does not exist.");
    }

    /**
     * Set index for sheet by sheet name.
     *
     * @param string $sheetName Sheet name to modify index for
     * @param int    $newIndex  New index for the sheet
     *
     * @return int New sheet index
     * @throws PHPExcel_Exception
     */
    public function setIndexByName( $sheetName, $newIndex )
    {
        $oldIndex = $this->getIndex($this->getSheetByName($sheetName));
        $pSheet   = array_splice(
            $this->workSheetCollection,
            $oldIndex,
            1
        );
        array_splice(
            $this->workSheetCollection,
            $newIndex,
            0,
            $pSheet
        );
        return $newIndex;
    }

    /**
     * Get sheet count
     *
     * @return int
     */
    public function getSheetCount()
    {
        return count($this->workSheetCollection);
    }

    /**
     * Get active sheet index
     *
     * @return int Active sheet index
     */
    public function getActiveSheetIndex()
    {
        return $this->activeSheetIndex;
    }

    /**
     * Set active sheet index
     *
     * @param int $pIndex Active sheet index
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function setActiveSheetIndex( $pIndex = 0 )
    {
        $numSheets = count($this->workSheetCollection);

        if ( $pIndex > $numSheets - 1 ) {
            throw new PHPExcel_Exception(
                "You tried to set a sheet active by the out of bounds index: {$pIndex}. The actual number of sheets is {$numSheets}."
            );
        }
        else {
            $this->activeSheetIndex = $pIndex;
        }
        return $this->getActiveSheet();
    }

    /**
     * Set active sheet index by name
     *
     * @param string $pValue Sheet title
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function setActiveSheetIndexByName( $pValue = '' )
    {
        if ( ( $worksheet = $this->getSheetByName($pValue) ) instanceof PHPExcel_Worksheet ) {
            $this->setActiveSheetIndex($this->getIndex($worksheet));
            return $worksheet;
        }

        throw new PHPExcel_Exception('Workbook does not contain sheet:' . $pValue);
    }

    /**
     * Get sheet names
     *
     * @return string[]
     */
    public function getSheetNames()
    {
        $returnValue    = [];
        $worksheetCount = $this->getSheetCount();
        for ( $i = 0; $i < $worksheetCount; ++$i ) {
            $returnValue[] = $this->getSheet($i)->getTitle();
        }

        return $returnValue;
    }

    /**
     * Add external sheet
     *
     * @param PHPExcel_Worksheet $pSheet      External sheet to add
     * @param int|null           $iSheetIndex Index where sheet should go (0,1,..., or null for last)
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function addExternalSheet( PHPExcel_Worksheet $pSheet, $iSheetIndex = NULL )
    {
        if ( $this->sheetNameExists($pSheet->getTitle()) ) {
            throw new PHPExcel_Exception("Workbook already contains a worksheet named '{$pSheet->getTitle()}'. Rename the external sheet first.");
        }

        // count how many cellXfs there are in this workbook currently, we will need this below
        $countCellXfs = count($this->cellXfCollection);

        // copy all the shared cellXfs from the external workbook and append them to the current
        foreach ( $pSheet->getParent()->getCellXfCollection() as $cellXf ) {
            $this->addCellXf(clone $cellXf);
        }

        // move sheet to this workbook
        $pSheet->rebindParent($this);

        // update the cellXfs
        foreach ( $pSheet->getCellCollection(FALSE) as $cellID ) {
            $cell = $pSheet->getCell($cellID);
            $cell->setXfIndex($cell->getXfIndex() + $countCellXfs);
        }

        return $this->addSheet($pSheet, $iSheetIndex);
    }

    /**
     * Get named ranges
     *
     * @return PHPExcel_NamedRange[]
     */
    public function getNamedRanges()
    {
        return $this->namedRanges;
    }

    /**
     * Add named range
     *
     * @param PHPExcel_NamedRange $namedRange
     *
     * @return boolean
     */
    public function addNamedRange( PHPExcel_NamedRange $namedRange )
    {
        if ( $namedRange->getScope() == NULL ) {
            // global scope
            $this->namedRanges[ $namedRange->getName() ] = $namedRange;
        }
        else {
            // local scope
            $this->namedRanges[ $namedRange->getScope()->getTitle() . '!' . $namedRange->getName() ] = $namedRange;
        }
        return TRUE;
    }

    /**
     * Get named range
     *
     * @param string                  $namedRange
     * @param PHPExcel_Worksheet|null $pSheet Scope. Use null for global scope
     *
     * @return PHPExcel_NamedRange|null
     */
    public function getNamedRange( $namedRange, PHPExcel_Worksheet $pSheet = NULL )
    {
        $returnValue = NULL;

        if ( $namedRange != '' && ( $namedRange !== NULL ) ) {
            // first look for global defined name
            if ( isset($this->namedRanges[ $namedRange ]) ) {
                $returnValue = $this->namedRanges[ $namedRange ];
            }

            // then look for local defined name (has priority over global defined name if both names exist)
            if ( ( $pSheet !== NULL ) && isset($this->namedRanges[ $pSheet->getTitle() . '!' . $namedRange ]) ) {
                $returnValue = $this->namedRanges[ $pSheet->getTitle() . '!' . $namedRange ];
            }
        }

        return $returnValue;
    }

    /**
     * Remove named range
     *
     * @param string                  $namedRange
     * @param PHPExcel_Worksheet|null $pSheet Scope: use null for global scope.
     *
     * @return PHPExcel
     */
    public function removeNamedRange( $namedRange, PHPExcel_Worksheet $pSheet = NULL )
    {
        if ( $pSheet === NULL ) {
            if ( isset($this->namedRanges[ $namedRange ]) ) {
                unset($this->namedRanges[ $namedRange ]);
            }
        }
        else {
            if ( isset($this->namedRanges[ $pSheet->getTitle() . '!' . $namedRange ]) ) {
                unset($this->namedRanges[ $pSheet->getTitle() . '!' . $namedRange ]);
            }
        }
        return $this;
    }

    /**
     * Get worksheet iterator
     *
     * @return PHPExcel_WorksheetIterator
     */
    public function getWorksheetIterator()
    {
        return new PHPExcel_WorksheetIterator($this);
    }

    /**
     * Copy workbook (!= clone!)
     *
     * @return PHPExcel
     */
    public function copy()
    {
        $copied = clone $this;

        $worksheetCount = count($this->workSheetCollection);
        for ( $i = 0; $i < $worksheetCount; ++$i ) {
            $this->workSheetCollection[ $i ] = $this->workSheetCollection[ $i ]->copy();
            $this->workSheetCollection[ $i ]->rebindParent($this);
        }

        return $copied;
    }

    /**
     * Implement PHP __clone to create a deep clone, not just a shallow copy.
     */
    public function __clone()
    {
        foreach ( $this as $key => $val ) {
            if ( is_object($val) || ( is_array($val) ) ) {
                $this->{$key} = unserialize(serialize($val));
            }
        }
    }

    /**
     * Get the workbook collection of cellXfs
     *
     * @return PHPExcel_Style[]
     */
    public function getCellXfCollection()
    {
        return $this->cellXfCollection;
    }

    /**
     * Get cellXf by index
     *
     * @param int $pIndex
     *
     * @return PHPExcel_Style
     */
    public function getCellXfByIndex( $pIndex = 0 )
    {
        return $this->cellXfCollection[ $pIndex ];
    }

    /**
     * Get cellXf by hash code
     *
     * @param string $pValue
     *
     * @return PHPExcel_Style|boolean False if no match found
     */
    public function getCellXfByHashCode( $pValue = '' )
    {
        foreach ( $this->cellXfCollection as $cellXf ) {
            if ( $cellXf->getHashCode() == $pValue ) {
                return $cellXf;
            }
        }
        return FALSE;
    }

    /**
     * Check if style exists in style collection
     *
     * @param PHPExcel_Style $pCellStyle
     *
     * @return boolean
     */
    public function cellXfExists( $pCellStyle = NULL )
    {
        return in_array($pCellStyle, $this->cellXfCollection, TRUE);
    }

    /**
     * Get default style
     *
     * @return PHPExcel_Style
     * @throws PHPExcel_Exception
     */
    public function getDefaultStyle()
    {
        if ( isset($this->cellXfCollection[ 0 ]) ) {
            return $this->cellXfCollection[ 0 ];
        }
        throw new PHPExcel_Exception('No default style found for this workbook');
    }

    /**
     * Add a cellXf to the workbook
     *
     * @param PHPExcel_Style $style
     */
    public function addCellXf( PHPExcel_Style $style )
    {
        $this->cellXfCollection[] = $style;
        $style->setIndex(count($this->cellXfCollection) - 1);
    }

    /**
     * Remove cellXf by index. It is ensured that all cells get their xf index updated.
     *
     * @param integer $pIndex Index to cellXf
     *
     * @throws PHPExcel_Exception
     */
    public function removeCellXfByIndex( $pIndex = 0 )
    {
        if ( $pIndex > count($this->cellXfCollection) - 1 ) {
            throw new PHPExcel_Exception("CellXf index is out of bounds.");
        }
        else {
            // first remove the cellXf
            array_splice($this->cellXfCollection, $pIndex, 1);

            // then update cellXf indexes for cells
            foreach ( $this->workSheetCollection as $worksheet ) {
                foreach ( $worksheet->getCellCollection(FALSE) as $cellID ) {
                    $cell    = $worksheet->getCell($cellID);
                    $xfIndex = $cell->getXfIndex();
                    if ( $xfIndex > $pIndex ) {
                        // decrease xf index by 1
                        $cell->setXfIndex($xfIndex - 1);
                    }
                    else if ( $xfIndex == $pIndex ) {
                        // set to default xf index 0
                        $cell->setXfIndex(0);
                    }
                }
            }
        }
    }

    /**
     * Get the cellXf supervisor
     *
     * @return PHPExcel_Style
     */
    public function getCellXfSupervisor()
    {
        return $this->cellXfSupervisor;
    }

    /**
     * Get the workbook collection of cellStyleXfs
     *
     * @return PHPExcel_Style[]
     */
    public function getCellStyleXfCollection()
    {
        return $this->cellStyleXfCollection;
    }

    /**
     * Get cellStyleXf by index
     *
     * @param integer $pIndex Index to cellXf
     *
     * @return PHPExcel_Style
     */
    public function getCellStyleXfByIndex( $pIndex = 0 )
    {
        return $this->cellStyleXfCollection[ $pIndex ];
    }

    /**
     * Get cellStyleXf by hash code
     *
     * @param string $pValue
     *
     * @return PHPExcel_Style|boolean False if no match found
     */
    public function getCellStyleXfByHashCode( $pValue = '' )
    {
        foreach ( $this->cellStyleXfCollection as $cellStyleXf ) {
            if ( $cellStyleXf->getHashCode() == $pValue ) {
                return $cellStyleXf;
            }
        }
        return FALSE;
    }

    /**
     * Add a cellStyleXf to the workbook
     *
     * @param PHPExcel_Style $pStyle
     */
    public function addCellStyleXf( PHPExcel_Style $pStyle )
    {
        $this->cellStyleXfCollection[] = $pStyle;
        $pStyle->setIndex(count($this->cellStyleXfCollection) - 1);
    }

    /**
     * Remove cellStyleXf by index
     *
     * @param integer $pIndex Index to cellXf
     *
     * @throws PHPExcel_Exception
     */
    public function removeCellStyleXfByIndex( $pIndex = 0 )
    {
        if ( $pIndex > count($this->cellStyleXfCollection) - 1 ) {
            throw new PHPExcel_Exception("CellStyleXf index is out of bounds.");
        }
        else {
            array_splice($this->cellStyleXfCollection, $pIndex, 1);
        }
    }

    /**
     * Eliminate all unneeded cellXf and afterwards update the xfIndex for all cells
     * and columns in the workbook
     */
    public function garbageCollect()
    {
        // how many references are there to each cellXf ?
        $countReferencesCellXf = [];
        foreach ( $this->cellXfCollection as $index => $cellXf ) {
            $countReferencesCellXf[ $index ] = 0;
        }

        foreach ( $this->getWorksheetIterator() as $sheet ) {
            // from cells
            foreach ( $sheet->getCellCollection(FALSE) as $cellID ) {
                $cell = $sheet->getCell($cellID);
                ++$countReferencesCellXf[ $cell->getXfIndex() ];
            }

            // from row dimensions
            foreach ( $sheet->getRowDimensions() as $rowDimension ) {
                if ( $rowDimension->getXfIndex() !== NULL ) {
                    ++$countReferencesCellXf[ $rowDimension->getXfIndex() ];
                }
            }

            // from column dimensions
            foreach ( $sheet->getColumnDimensions() as $columnDimension ) {
                ++$countReferencesCellXf[ $columnDimension->getXfIndex() ];
            }
        }

        // remove cellXfs without references and create mapping so we can update xfIndex
        // for all cells and columns
        $countNeededCellXfs = 0;
        $map                = [];
        foreach ( $this->cellXfCollection as $index => $cellXf ) {
            if ( $countReferencesCellXf[ $index ] > 0 || $index == 0 ) { // we must never remove the first cellXf
                ++$countNeededCellXfs;
            }
            else {
                unset($this->cellXfCollection[ $index ]);
            }
            $map[ $index ] = $countNeededCellXfs - 1;
        }
        $this->cellXfCollection = array_values($this->cellXfCollection);

        // update the index for all cellXfs
        foreach ( $this->cellXfCollection as $i => $cellXf ) {
            $cellXf->setIndex($i);
        }

        // make sure there is always at least one cellXf (there should be)
        if ( empty($this->cellXfCollection) ) {
            $this->cellXfCollection[] = new PHPExcel_Style();
        }

        // update the xfIndex for all cells, row dimensions, column dimensions
        foreach ( $this->getWorksheetIterator() as $sheet ) {
            // for all cells
            foreach ( $sheet->getCellCollection(FALSE) as $cellID ) {
                $cell = $sheet->getCell($cellID);
                $cell->setXfIndex($map[ $cell->getXfIndex() ]);
            }

            // for all row dimensions
            foreach ( $sheet->getRowDimensions() as $rowDimension ) {
                if ( $rowDimension->getXfIndex() !== NULL ) {
                    $rowDimension->setXfIndex($map[ $rowDimension->getXfIndex() ]);
                }
            }

            // for all column dimensions
            foreach ( $sheet->getColumnDimensions() as $columnDimension ) {
                $columnDimension->setXfIndex($map[ $columnDimension->getXfIndex() ]);
            }

            // also do garbage collection for all the sheets
            $sheet->garbageCollect();
        }
    }

    /**
     * Return the unique ID value assigned to this spreadsheet workbook
     *
     * @return string
     */
    public function getID()
    {
        return $this->uniqueID;
    }
}
